Next Article in Journal
Research on an EV Dynamic Wireless Charging Control Method Adapting to Speed Change
Next Article in Special Issue
Effect of Mixing Regimes on Cow Manure Digestion in Impeller Mixed, Unmixed and Chinese Dome Digesters
Previous Article in Journal
Robust Localization for Robot and IoT Using RSSI
Article Menu
Issue 11 (June-1) cover image

Export Article

Open AccessArticle

Development of an Optimised Chinese Dome Digester Enables Smaller Reactor Volumes; Pilot Scale Performance

1
Centre for Energy Research and Development, Obafemi Awolowo University, Ile-ife, Nigeria
2
Sub-Department Environmental Technology, Wageningen University and Research, 6708 WG Wageningen, The Netherlands
*
Author to whom correspondence should be addressed.
Energies 2019, 12(11), 2213; https://doi.org/10.3390/en12112213
Received: 7 April 2019 / Revised: 3 June 2019 / Accepted: 3 June 2019 / Published: 11 June 2019
(This article belongs to the Special Issue Biogas for Rural Areas )
  |  
PDF [2285 KB, uploaded 11 June 2019]
  |  

Abstract

Chinese dome digesters are usually operated at long hydraulic retention times (HRT) and low influent total solids (TS) concentration because of limited mixing. In this study, a newly optimised Chinese dome digester with a self-agitating mechanism was investigated at a pilot scale (digester volume = 500 L) and compared with a conventional Chinese dome digester (as blank) at 15% influent TS concentration at two retention times (30 and 40 days). The reactors were operated at ambient temperature: 27–33 °C. The average specific methane production, volatile fatty acids and percentage of volatile solids (VS) reduction are 0.16 ± 0.13 and 0.25 ± 0.05L CH4/g VS; 1 ± 0.5 and 0.7 ± 0.3 g/L; and 51 ± 14 and 57 ± 10% at 40 days HRT (day 52–136) for the blank and optimised digester, respectively. At 30 days HRT (day 137–309) the results are 0.19 ± 0.12 and 0.23 ± 0.04 L CH4/g VS; 1.2 ± 0.6 and 0.7 ± 0.3 g/L; and 51 ± 9 and 58 ± 11.6%. Overall, the optimised digester produced 40% more methane than the blank, despite the high loading rates applied. The optimised digester showed superior digestion treatment efficiency and was more stable in terms of VFA concentration than the blank digester, can be therefore operated at high influent TS (15%) concentration. View Full-Text
Keywords: Mixing; optimised; household digester; Chinese dome digester (CDD); self-agitation; blank Mixing; optimised; household digester; Chinese dome digester (CDD); self-agitation; blank
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Jegede, A.O.; Zeeman, G.; Bruning, H. Development of an Optimised Chinese Dome Digester Enables Smaller Reactor Volumes; Pilot Scale Performance. Energies 2019, 12, 2213.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top